Enhanced, robust light-driven H2 generation by gallium-doped titania nanoparticles

Si Luo, Thuy Duong Nguyen-Phan, Dimitriy Vovchok, Iradwikanari Waluyo, Robert M. Palomino, Andrew D. Gamalski, Laura Barrio, Wenqian Xu, Dmitry Polyansky, José A. Rodriguez, Sanjaya D. Senanayake

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The splitting of water into molecular hydrogen and oxygen with the use of renewable solar energy is considered one of the most promising routes to yield sustainable fuel. Herein, we report the H2 evolution performance of gallium doped TiO2 photocatalysts with varying degrees of Ga dopant. The gallium(iii) ions induced significant changes in the structural, textural and electronic properties of TiO2 nanoparticles, resulting in remarkably enhanced photocatalytic activity and good stability for H2 production. Ga3+ ions can act as hole traps that enable a large number of excited electrons to migrate towards the TiO2 surface, thereby facilitating electron transfer and charge separation. Additionally, the cationic dopant and its induced defects might introduce a mid-gap state, promoting electron migration and prolonging the lifetime of charge carrier pairs. We have discovered that the optimal Ga dopant concentration was 3.125 at% and that the incorporation of platinum (0.5 wt%) as a co-catalyst further improved the H2 evolution rate up to 5722 μmol g-1 h-1. Pt not only acts as an electron sink, drastically increasing the electron/hole pair lifetime, but it also creates an intimate contact at the heterojunction between Pt and Ga-TiO2, thus improving the interfacial electron transfer process. These catalyst design strategies provide new ways of designing transition metal photocatalysts that improve green fuel production from renewable solar energy and water.

Original languageEnglish
Pages (from-to)2104-2112
Number of pages9
JournalPhysical Chemistry Chemical Physics
Volume20
Issue number3
DOIs
Publication statusPublished - Jan 1 2018

Fingerprint

Gallium
solar energy
gallium
electron transfer
titanium
fuel production
Nanoparticles
catalysts
life (durability)
nanoparticles
Electrons
polarization (charge separation)
electron states
sinks
water
Doping (additives)
heterojunctions
charge carriers
Photocatalysts
ions

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Luo, S., Nguyen-Phan, T. D., Vovchok, D., Waluyo, I., Palomino, R. M., Gamalski, A. D., ... Senanayake, S. D. (2018). Enhanced, robust light-driven H2 generation by gallium-doped titania nanoparticles. Physical Chemistry Chemical Physics, 20(3), 2104-2112. https://doi.org/10.1039/c7cp04155a

Enhanced, robust light-driven H2 generation by gallium-doped titania nanoparticles. / Luo, Si; Nguyen-Phan, Thuy Duong; Vovchok, Dimitriy; Waluyo, Iradwikanari; Palomino, Robert M.; Gamalski, Andrew D.; Barrio, Laura; Xu, Wenqian; Polyansky, Dmitry; Rodriguez, José A.; Senanayake, Sanjaya D.

In: Physical Chemistry Chemical Physics, Vol. 20, No. 3, 01.01.2018, p. 2104-2112.

Research output: Contribution to journalArticle

Luo, S, Nguyen-Phan, TD, Vovchok, D, Waluyo, I, Palomino, RM, Gamalski, AD, Barrio, L, Xu, W, Polyansky, D, Rodriguez, JA & Senanayake, SD 2018, 'Enhanced, robust light-driven H2 generation by gallium-doped titania nanoparticles', Physical Chemistry Chemical Physics, vol. 20, no. 3, pp. 2104-2112. https://doi.org/10.1039/c7cp04155a
Luo S, Nguyen-Phan TD, Vovchok D, Waluyo I, Palomino RM, Gamalski AD et al. Enhanced, robust light-driven H2 generation by gallium-doped titania nanoparticles. Physical Chemistry Chemical Physics. 2018 Jan 1;20(3):2104-2112. https://doi.org/10.1039/c7cp04155a
Luo, Si ; Nguyen-Phan, Thuy Duong ; Vovchok, Dimitriy ; Waluyo, Iradwikanari ; Palomino, Robert M. ; Gamalski, Andrew D. ; Barrio, Laura ; Xu, Wenqian ; Polyansky, Dmitry ; Rodriguez, José A. ; Senanayake, Sanjaya D. / Enhanced, robust light-driven H2 generation by gallium-doped titania nanoparticles. In: Physical Chemistry Chemical Physics. 2018 ; Vol. 20, No. 3. pp. 2104-2112.
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